React App-如何更新链接URL消息

npm install react-router-dom

import { BrowserRouter as Router, Route, Link } from 'react-router-dom';

function App() {
  return (
    <Router>
      <div>
        <nav>
          <ul>
            <li>
              <Link to="/">首页</Link>
            </li>
            <li>
              <Link to="/about">关于</Link>
            </li>
            <li>
              <Link to="/contact">联系我们</Link>
            </li>
          </ul>
        </nav>

        <Route path="/" exact component={Home} />
        <Route path="/about" component={About} />
        <Route path="/contact" component={Contact} />
      </div>
    </Router>
  );
}

<Link to="/about">关于</Link>

<Link to="/contact">联系我们</Link>